Same domain name on office365 and outside
I have a domain, on which I have access to DNS, but don't want to change MX (because it is in use for other purposes). I have registered the same domain name with Office365. Now I send mail from office365 (which works), but receiving still goes to the old server. Now my idea was to forward email to office365 to receive mail, I expected that I would be given an on-microsoft alias that I could forward to, but that doesn't seem to be the case. How do I get around this?